Storage Controlling Device, Storage Controlling Method, and Non-Transitory Computer-Readable Recording Medium

1. A storage controlling device comprising: a memory; and a processor configured to: obtain information on each of a plurality of remaining lives of each of a plurality of storage devices included in a redundancy storage system; determine each of a plurality of timings for replacement of each of the plurality of storage devices so that a number of the timings for replacement included in a predetermined time range is less than a predetermined number, each of a plurality of timings for replacement being determined to be earlier than each of the plurality of timings that malfunctions occur in each of the plurality of storage devices corresponding to each of a plurality of timings for replacement, each of the plurality of timings that malfunctions occur being specified based on the obtained information; and output information that indicates at least one of the plurality of determined timings for replacement.

2. The storage controlling device according to claim 1 , wherein the information includes the number of reallocatable separate regions of each of the plurality of storage devices, and a threshold value for the reallocatable separate regions which corresponds to specifications of each of the plurality of storage devices, and wherein the processor is configured to estimate each of the plurality of remaining lives based on a value which is equal to the number of reallocatable separate regions of each of the plurality of storage devices, which is contained in the state information regarding each of the plurality of storage devices, minus the threshold value.

3. The storage controlling device according to claim 2 , wherein the predetermined time range is determined based on a value obtained by dividing a predetermined length of time, which is taken to replace one of the plurality of storage devices, by an average value of time intervals between the occurrences of reallocation in each of the plurality of storage devices.

4. The storage controlling device according to claim 2 , wherein the processor is further configured to determine each of the plurality of timings for replacement based on a magnitude relationship between a value, which is equal to the number of reallocatable separate regions minus a value greater than the threshold value in a storage device of which the number of reallocated separate regions has most recently changed among the plurality of storage devices, and values which are respectively equal to the numbers of reallocatable separate regions minus threshold values in the plurality of storage devices other than the storage device of which the number of reallocated separate regions has most recently changed among the plurality of storage devices.

5. The storage controlling device according to claim 1 , wherein the information includes a non-usage ratio indicating a ratio between the number of reallocatable separate regions and the maximum number of reallocatable separate regions of each of the plurality of storage devices, and a threshold value for the non-usage ratio corresponding to the specifications of each of the plurality of storage devices, and wherein the processor is further configured to estimate each of the plurality of remaining lives based on a value which is equal to a non-usage ratio of each of the plurality of storage devices, which is contained in the state information regarding each of the plurality of storage devices, minus a threshold value for the non-usage ratio.

6. A storage controlling method comprising: obtaining information on each of a plurality of remaining lives of each of a plurality of storage devices included in a redundancy storage system; determining each of a plurality of timings for replacement of each of the plurality of storage devices so that a number of the timings for replacement included in a predetermined time range is less than a predetermined number, each of a plurality of timings for replacement being determined to be earlier than each of the plurality of timings that malfunctions occur in each of the plurality of storage devices corresponding to each of a plurality of timings for replacement, each of the plurality of timings that malfunctions occur being specified based on the obtained information; and outputting information that indicates at least one of the plurality of determined timings for replacement.

7. A non-transitory computer-readable recording medium storing a storage controlling program that causes a computer to execute a process comprising: obtaining information on each of a plurality of remaining lives of each of a plurality of storage devices included in a redundancy storage system; determining each of a plurality of timings for replacement of each of the plurality of storage devices so that a number of the timings for replacement included in a predetermined time range is less than a predetermined number, each of a plurality of timings for replacement being determined to be earlier than each of the plurality of timings that malfunctions occur in each of the plurality of storage devices corresponding to each of a plurality of timings for replacement, each of the plurality of timings that malfunctions occur being specified based on the obtained information; and outputting information that indicates at least one of the plurality of determined timings for replacement.